CN212716774U

CN212716774U - Steam turbine shaft seal device

Info

Publication number: CN212716774U
Application number: CN202021430382.9U
Authority: CN
Inventors: 张俊峰; 李平
Original assignee: Baotou Iron and Steel Group Co Ltd
Current assignee: Baotou Iron and Steel Group Co Ltd
Priority date: 2020-07-20
Filing date: 2020-07-20
Publication date: 2021-03-16
Anticipated expiration: 2030-07-20

Abstract

The utility model discloses a steam turbine shaft seal device, which comprises a compressed air distribution pipe additionally arranged between the outer side of a steam turbine shaft seal tooth and a bearing bush, wherein the distribution pipe is uniformly provided with blowing holes, and compressed air is uniformly blown from the blowing holes; the utility model discloses a steam turbine bearing seal device reforms transform simply, and is with low costs, has effectively avoided the outside leakage of bearing seal vapour of the sealed tooth of bearing seal, avoids leaking the oil deterioration and the vacuum decline that lead to behind the steam admission axle bush, has prolonged the life cycle of steam turbine, and the application is good.

Description

Steam turbine shaft seal device

Technical Field

The utility model relates to the technical field of machinery, especially, relate to a steam turbine bearing seal device.

Background

At present, a steam turbine is common equipment in a power supply plant, and the problem that the steam turbine frequently leaks outwards due to abrasion of a shaft seal sealing tooth during operation is that the oil quality is deteriorated after the leaked steam enters a bearing bush, so that normal production is influenced; when the problems are met, the conventional adjustment solution is to reduce the steam supply pressure of the shaft seal or to stop the machine to replace the seal teeth, and the conventional adjustment solution has the defects that:

1. the vacuum of the unit is reduced after the steam pressure of the shaft seal is reduced, and the efficiency is reduced;

2. when the machine is stopped and the sealing teeth are replaced, the yield of the machine set is reduced, the operation period is prolonged, and the maintenance cost is increased;

therefore, the technical personnel in the field are dedicated to develop a steam turbine shaft seal device, and the steam turbine shaft seal device aims to solve the problem that the production is influenced by outward leakage of shaft seal steam caused by abrasion of shaft seal sealing teeth in the prior art.

SUMMERY OF THE UTILITY MODEL

In view of prior art's above-mentioned defect, the utility model aims to solve the technical problem that because the outside leakage of bearing seal vapour that the wearing and tearing of the sealed tooth of bearing seal lead to among the prior art, lead to oil to worsen after leaking steam gets into the axle bush to lead to the vacuum to descend, efficiency reduces, the defect problem that the maintenance cost increases.

In order to achieve the purpose, the utility model provides a steam turbine shaft seal device, which comprises a compressed air distribution pipe additionally arranged between the outer side of a steam turbine shaft seal tooth and a bearing bush, wherein 10-30 blowing holes are uniformly distributed on the distribution pipe, compressed air is uniformly blown from the blowing holes, a compressed air curtain is formed between the shaft seal leakage and the bearing bush, and leakage steam is isolated from entering the bearing bush from the shaft seal sealing tooth, and meanwhile, the cooling effect can also be realized on the bearing bush;

furthermore, the compressed air distribution pipe is circular, and the diameter of the compressed air distribution pipe is 500-1000 mm;

further, the diameter of the blowing hole is 3-8 mm;

in the preferred embodiment of the present invention,

the diameter of the compressed air distribution pipe is 700 mm;

the diameter of the blowing hole is 5 mm;

scheme more than adopting, the utility model discloses a steam turbine bearing seal device has following technological effect:

1. the utility model discloses a steam turbine shaft seal device, which utilizes the prior compressed air to mix and isolate the steam turbine shaft seal leakage and plays a role in cooling the region; need not to reform transform current bearing seal equipment, and need not to increase other control system, both practiced thrift the cost, effectively avoided the outside leakage of bearing seal vapour of the sealed tooth of bearing seal again, avoided leaking the oil deterioration and the vacuum decline that lead to behind the vapour entering axle bush, prolonged the life cycle of steam turbine.

2. The steam turbine shaft seal device of the utility model has the advantages of simple structure, light weight, low manufacturing cost and low later maintenance cost, is suitable for steam turbines of various models, and has good applicability;

to sum up, the utility model discloses a steam turbine bearing seal device reforms transform simply, and is with low costs, has effectively avoided the outside leakage of bearing seal vapour of the sealed tooth of bearing seal, avoids leaking the oil that leads to behind the steam admission axle bush and worsens and the vacuum decline, has prolonged the life cycle of steam turbine, and the application is good.

The conception, specific structure and technical effects of the present invention will be further described with reference to the accompanying drawings and specific embodiments, so as to fully understand the objects, features and effects of the present invention.

Drawings

FIG. 1 is a schematic structural view of a steam turbine shaft seal assembly of the present invention;

in the figure, 1, a steam turbine cylinder body; 2. a shaft seal tooth; 3. a compressed air distribution pipe; 4. bearing bushes; 5. and (4) blowing holes.

Detailed Description

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings for clarity and understanding of the technical contents. The present invention may be embodied in many different forms of embodiments, and the scope of the invention is not limited to the embodiments described herein.

In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.

As shown in fig. 1, the utility model discloses a steam turbine shaft seal device, include that install the compressed air distribution pipe 3 that circular diameter is 700mm additional between the 2 outsides of steam turbine bearing seal tooth and axle bush 4, evenly arrange 12 spraying and blowing holes 5 that diameter is 5mm on the distribution pipe, compressed air evenly jets from spraying and blowing the hole, forms compressed air curtain between bearing seal gas leakage and axle bush, and isolated leakage steam gets into the axle bush from the bearing seal tooth, also can play the cooling effect to the axle bush simultaneously;

when the device is used, the existing compressed air in a factory building is used as an air source, the compressed air is distributed through the compressed air distribution pipe 3 and is uniformly sprayed out of the spraying and blowing holes 5, a compressed air curtain is formed between the abrasion air leakage position of the shaft seal sealing teeth and the bearing bush to isolate leakage steam from entering the bearing bush from the shaft seal sealing teeth, and meanwhile, the compressed air curtain plays a role in cooling the bearing bush;

through practical use, in the whole working process of the steam turbine shaft seal device using the embodiment, shaft seal steam which is not leaked from the abrasion part of the shaft seal sealing teeth is not leaked outwards and enters the bearing bush, the oil quality at the bearing bush is not obviously deteriorated, the vacuum of the whole steam turbine is not reduced, the working efficiency of the steam turbine is effectively improved, the maintenance cost of the steam turbine is reduced, and the safety is good.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the teachings of this invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. The utility model provides a steam turbine bearing seal device, a serial communication port, include and install compressed air distributing pipe (3) additional between steam turbine bearing seal tooth (2) outside and axle bush (4), evenly arrange 10 ~ 30 blowing hole (5) on compressed air distributing pipe (3), compressed air evenly jets from blowing hole (5), forms compressed air curtain between bearing seal gas leakage and axle bush, and isolated leakage steam gets into the axle bush from the sealed tooth of bearing seal, also can play cooling effect to the axle bush simultaneously.

2. The apparatus of claim 1,

the compressed air distribution pipe is circular, and the diameter is 500-1000 mm.

3. The apparatus of claim 1,

the diameter of the blowing hole is 3-8 mm.

4. The apparatus of claim 1,

the diameter of the compressed air distribution pipe is 700 mm;

the diameter of the blowing hole is 5 mm.